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CVE-2026-25740

Privilege escalation to the `CAP_NET_RAW` capability via the `programs.captive-browser` NixOS module

MEDIUM
5.8
CVSS Score
Published: February 9, 2026 at 08:17 PM UTC
Updated: June 17, 2026 at 10:25 AM UTC
1 product affected across 1 vendorNixpkgs

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Severity
MEDIUM5.8
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

captive browser, a dedicated Chrome instance to log into captive portals without messing with DNS settings. In 25.05 and earlier, when programs.captive-browser is enabled, any user of the system can run arbitrary commands with the CAP_NET_RAW capability (binding to privileged ports, spoofing localhost traffic from privileged services...). This vulnerability is fixed in 25.11 and 26.05.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (3)

x_refsource_CONFIRM
Source: cverecord
https://github.com/NixOS/nixpkgs/security/advisories/GHSA-wc3r-c66x-8xmc
x_refsource_MISC
Source: cverecord
https://github.com/NixOS/nixpkgs/pull/487775
x_refsource_MISC
Source: cverecord
https://github.com/NixOS/nixpkgs/pull/487779

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.8MEDIUMGitHub_M
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-250

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